Reversible chuck for lathes



Dec; 9, 192.0

c. P. WETMORE REVERSIBLE CHUCK FOR LATHES Fnd Dec. 2 Sheets-Sheet i INVENTOR.

C. P. WET/4on CUT/V553. WW

. ATTORNEYS.

Dec. 9, 1930. c. P. W ETMORE REVERSIBLE cnucx FOR LATHES Filed Dec.

2 Sheets-Sheet 2 INVENTOR.

C E WET/10 RE, 7

I W a I JTTORNE) S.

On the face of the head lO, is a third parallel projection 20, spaced between the projections 13' and 14, the said projection 20 supporting the devices which are employed for locking and retaining the chucking member 17 in either of, its: operativepositions,

' that is, alwayswithg'the said member stand ing in a transverse plane which is perpendicular to the axis of the'clutch; and with the openingithrough such member aligned with such axis. -suchlockin'g and retaining means comprises a radially movable bolt21, sliding in a socket in the projection 20; and adapted at its inner end to enter eitherofthe recesses 22 and 23, formed oppositely in"fthe"on'ter ze de of chuc mem r-1 am a ign theopening in "the same ,aceuratelyfwith relaition to the; axis ofthelathespindle; The said reces ses are preferably loushed; with i wearresisting material, and the bolt 2llis hardened,:ior thepurposeof avoiding any variation in such alignment 7 :Egzact positioning of the chucking member inEi-ts operative plane is secured by taperingone sideof theend of the bolt as at 24:, and forming the grecesses to correspond,asindicated in Fig. 2.

I An expansionsprin-g; 2 5, confined in the socket or channelin the projection2 0 by cover plates 26 i and 261', bears against the rearigend radial a meo, by means of which the pin ion may be rotated to withdraw"'the b o;1t 21 against the opposition ofthe spring ;"and thus release the clamping memberfl, for a turning'movement of ,180in its radially disposed bearings; *Upon' conipletioniof such turning movement; the bolt 21 is actuatedby thespringf25, to lock the parts in exact operativefposition. v CentrifugaL force acting upon '{the (lever 30finsures such locking der- 7 ing rotation ofthe chuck."v

I An upper chuckingi 'jawi3l" lower chucking jaw'32,are disposed at theiendsl. of

the elongated. opening in the member v1"? 's'uch' ja s receiving between "themfithe ,7 coupling blank-33, as shown 'i'nQ-Fig l ilgprefer to engagestheexteriorjsurfacefof the coupling blank at threepoints to insure accurate cenfelting llhfi-ChllCkytWO ofsuch points arena 31 being carriedV-by-o-the upper j w;;31 ,.and

I one, indicated f32 fbytheflower aw points of engage entj in arrangement;

The'jjaws' aland 32 lareguided for a. sl in frame 517, which ater is provided with" a tongtie 134 iformed bly reducingl the ithickn essofv th Bj *7 eti t i l de a jace elongated "openings thereim-jto r f l o miaj t-a l ej for the jaws. The latter are each formed of two vparts, which when assembled form at the sides of the jaw a groovewhich receives the tongue 34, and guidesthe jaws in their radial or inward and outward movements.

Thetwoj parts 35 and 36of theupper jaw 31 are 'securedin assembled positionby means of screws counter-sunk into one part and threaded into the'other. par-$ 37 and 38' of the lowerjaw-am secured v together by -'other-scre'ws. =i

The lower journal 16 of the chucking frame 17 is bored centrally for the accommodation ofaj screw '39, the end of which is threaded I rin'to"the lower jaw Q32, and an expansion spring 40, confined by the-head of the screw.

n an enlargement of the central bore, acts normally to; withdraw-v the jaw 32 from 7 its positionf v engagement withfthe; coupling Y blank.

A i cam slide 4 1; isarrfanged in the channel at the underside'of-jaw; 32, and is adjusted and held in jltS';lOIlgltlldlIltlnPOSltlOIl upon the rib at the lower; side of the opening in the chucking frame 17 ,hymeansofsetscrews' alt-and 41? passed through threaded openings inf-the adjfacentisides of the frame, a;

ence by the o ,The face-bathe] slide 41 1s eased with bored centrallyiforflthe reception of a..-set

, screw--5 l,-' thef point of, vwhich;bearssupon the upper- Side; of -the jaw: 31, and slide bars- 52 clamp the couplingqblank between them.

illh'e lower -j-aw;?32; isgprovided with; a'second V grooveiwithinjthelarger grooveat both sides '7 I The weight of: the. r projection? 20 and the parts carried thereby'j zis Joffse't iby thei'pro for; the accommodation of the-slide bars 52 e g vision-of a counterbalance-5 F o' th 'h" d s movement toward and from each otherinthe HIP n 6 ea shown in Fig. l s- A- slot 42-inthe said' slide 1 will permit its iniovem'ent Without interferscrew 39 which-: 'pa'sses" through V the slot, l 1

and. 53 efxtend betwenithe lower depending corners of the j 25W; 31; Yand the outer ends: of the; floating levers F47 and 48 @so that?v when 7 pressure is applied to fthe ruppererjaw {by cmeans of the ;set" screw '51; the motion is transmit-ted-Q reverselyitothe-lower1jaw eso' 1 that the jtw'o'jfaws are-caused toapproach and state-10f abalancefia lni'ifact; lal'l-cof the. parts of the journals of thechucking member for dependent ofsuch means for; transmitting such motion to the otherrjawhto effect a simultaneous engagement of :both jaws with thework.

.5. In a lathe chuck, a head for connection to the spindle of a lathe, a chucking member carried thereby, oppositely-moving j aws mounted to slide in the said member, "means for moving one of such jaws, and meanscom-i prising rocking levers actuatedin themovement :of the first jaw for simultaneously movingthegother jawj.

6; Ina lathe chuck, ahead for connection to a lathe: spindle, 'a' ,chucking member mounted in the saidhead, a pair vof oppositely movablejaws slidably mounted in the said member, pressure means {for moving one of the jaws, and meanscomprisingslide bars and rocking levers intermediate the jaws for transmitting the movement of the. first jaw tothesecondjavw: a f 7. In -a lathe. chuck, a head "for comma tion to a lathe spindle,,a ,chuckingmember ment ofthe bolt with the chucking member. moving one of suchjawsQandconnections in- 11. In a chuckrfor-lathes,a head for connection to the spindle of a lathe, a reversible chucking member carrying chucking jaws journaled in the said head for rotation on an axistransverse to that of the chucking memher and lathe spindle, the said chucking mem- 7 her being provided with peripheral recesses, a sliding bolt on they head for engagement with one or the other of the said recesses .to lock thechucking memberin either position on the head, devices operating centrifugally I to maintain the locking engagement of the p bolt with the chucking member, and a counter-balanceffor the-said-locking means and;

devices. 7

In testimony whereof, I'have signed, my name at Milwaukee, this27thfday of December, 1924.: A T CHARLES (P. WETMORE.

-mounted in the head, a, pair of oppositely movable jaws mounted in thesaid member, 1

means for moving one of the-jaws,. m eans including rocking levers 'for transmitting such mo,vement to the other jaw, and means for adjusting th'eposition of the. said levers in the chucking'member. Y I V r i 8. In a reversiblechuck'forlathes,a head 'for connection to thespindle of a lathe, a

the head for lockingithe chucking member :in position upon the said head, and devices operating centrifugally to 'maintain the locking engagement of the chucking mem- .ber'inrelationitothe head. I

chucking member ournaled on the-said head i I for rotation on an axis transverse to that of L thesaid head. and.spindle,;means=carried:by

9.- In a reversible chuck for lathes, ahead for connection to the spindle of a lathe, a

chucking member journaled' on the said'head for rotation *on' an axis transverse to j that of the said head and spindle, means carried by g j the head forlockingthe chucking member in ;position'upon thef-said head, devices 'oper saidalocking ;means I and devices] ating centrif-ugally tomaintainthelocking nce for-the I fnection to the-spindle of alathe, a reversible chucking memberr carrying chucking jaws I journaled in the said :head forrotation on i; v i .an axis transverse-to.th ateof the chucking v '-lment ,with'one or theeotherwq the'said recesses to lock .thechucking member ineither ;:j x

.positionon the ;l1ead,"and devices operating I: I ?eet ff lly 1 9freeman:melam ne-en age;- 1 -I v T i "not 

